The promoter decided to sign 2 or 3 bands more for the same event in order to pack it all as if it was a festival (nowadays festivals are much more fashionable than concerts in here) and then being able to sell much more expensive tickets. Probably being held in a place like Palau Sant Jordi. Side result: Radiohead fans will get a shortened version of the show.

But the truth is that this is only my guess, I have no info about that. The other logical option I can imagine is Sonar, but I can't understand how they didn't put the proper name on their website then. I would discard Primavera completely as it's not in June at all.